Update PolyGerrit screenshots on the homepage

Update Gerrit screenshots on the homepage with the
new PolyGerrit UX.

NOTE: The real-estate for the screenshots is very narrow
and the images are looking very small and difficult to
read. Revamping the homepage layout is out of scope for
this change, and it should be addressed as a follow-up.

Bug: Issue 11391
Change-Id: I8090bcda47a018d7e4d7a0d3e8cc15e7e982d0b7
diff --git a/images/access.png b/images/access.png
index cd93b2d..75e9723 100644
--- a/images/access.png
+++ b/images/access.png
Binary files differ
diff --git a/images/branches.png b/images/branches.png
index e6778ac..9b15ac3 100644
--- a/images/branches.png
+++ b/images/branches.png
Binary files differ
diff --git a/images/project-list.png b/images/project-list.png
index 7853d27..3d86cb0 100644
--- a/images/project-list.png
+++ b/images/project-list.png
Binary files differ